For twenty-five years, a single elegant theory governed how scientists understood lithium ion movement in solid electrolytes — until it didn't. An international collaboration between Sogang University and Japan's Institute for Molecular Science has shown that lithium ions are not pushed forward by the rotational motion of surrounding molecules, as the paddlewheel theory long held, but instead escape through the cooperative opening of molecular cages formed by neighboring anions. The distinction is not merely technical: it reorients the entire design philosophy for solid-state batteries, pointi